Debugger: fix infinite recursion when resolving lambdas

* Should fix #14346. Uploaded executable there doesn't work anymore,
but this patch is prepared for case in #16040, and fixes
#16680 too.
* The issue is that if lambda parameters use an alias, this alias
has that lambda as a parent. Specifically the compiler generates
operator() subprogram, Debugger tries to resolve types for its
parameters, but at the same time it is a parent namespace for
those types.
* Call chain: operator()( -> type 1 -> namespace: operator()( ->
type 1 -> namespace: operator()( -> ...

Change-Id: I7aad150a8d9de4f0c01ae0c1db5e486416b72112
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3824
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

Debugger: Split into core library and application.

- Add subfolder src/kits/debugger which contains the debugger's core
functionality and lower layers. Correspondingly add headers/private/debugger
for shared headers to be used by clients such as the Debugger application
and eventual remote_debug_server. Adjust various files to account for
differences as a result of the split and moves.
- Add libdebugger.so to minimal Jamfile.